Contents

What Is Fibrosarcoma?

Summary

A fibrosarcoma is a rare, malignant type of soft tissue sarcoma that is made of fibrous connective tissues that connect, support, and surround the bones. They can spread and divide incredibly quickly.

Initial symptoms are not obvious, however, over time, you may notice a lump or swelling that may increase in size, pain or tenderness in the same area, fatigue, and unintentional weight loss.

A confirmed diagnosis of fibrosarcoma is difficult due to their rarity. The prognosis is generally poor due to the condition's aversion to radio and chemotherapy and a high rate of recurrence [1]. Surgical resection is a common method of treatment [2].

Recommended care

You should see your primary care doctor in the next few days to have your symptoms evaluated. It is likely that your physician will want to perform imaging (x-ray or MRI).

Fibrosarcoma Symptoms

In its early stages, a fibrosarcoma usually does not cause any obvious signs or symptoms. However, over time, the following symptoms may arise:

A lump or swelling: This may or may not increase in size.

Pain and/or tenderness: This occurs specially if a tumor presses on surrounding nerves or muscles.

Fibrosarcoma Causes

In general, any cancer is the result of cells dividing and growing uncontrollably. Fibrosarcoma originate in the cells of fibrous tissues called fibroblasts then spread aggressively into other bones such as the femur, tibia and mandible [2]. Fibrosarcoma have a characteristic pathologic finding of spindled fibroblasts or myofibroblasts which are immature, not fully functioning forms of normal, adult fibroblasts. These immature fibroblasts divide rapidly and spread quickly. The exact cause of the uncontrollable growth related to fibrosarcoma is not completely known or understood; however, genetics, age, gender, and certain exposures can increase the risk of development.

Genetics, age, and gender

There are two types of fibrosarcoma: a congenital form that occurs in infants under the age of 1 and an adult form. The following factors affect the risk of development in different ways.

Genetics: People with certain inherited conditions such as Neurofibromatosis Type 1 or Tuberous Sclerosis can often develop fibrosarcoma [3].

Age: Fibrosarcoma most commonly occur in people between the ages of 25 to 79, but the peak for the adult-type is between 30 and 60 years of age [1].

Gender: Depending on the source, men and women can develop the disease at equal rates.

Exposure-related risks

People with the following exposures are more at risk than the general population [4]:

Chemical exposure: Certain chemicals such as herbicides and arsenic may increase the risk of fibrosarcoma and other types of soft tissue sarcomas.

Radiation exposure: Prior radiation treatment for other cancers can also increase risk for development of fibrosarcoma.

Diagnosis

The diagnosis of fibrosarcoma is a difficult one. There are many, similar spindle-cell shaped sarcomas [7], so there is a high chance of misdiagnosis and inappropriate treatment. Proper identification and diagnosis is key for adequately preventing and/or minimizing spread of the disease.

Your physician will conduct a biopsy of the mass in order to fully examine the cells and makeup of the tumor. This biopsy can either take small samples from different parts of the tumor (core needle biopsy) or take a larger sample via surgery.

Surgery, radiation, and chemotherapy

The three main treatment modalities for cancer include surgery, radiation therapy, and chemotherapy. Fibrosarcoma have a low sensitivity to toward radiation therapy and chemotherapy, so surgical removal is first-line standard therapy [2]. Follow-up radiation or chemotherapy after surgery also usually has a low response rate, and use will largely depend on how much of the area was affected during surgery.

Prognosis

Unfortunately, the overall prognosis for fibrosarcoma is quite poor due to the aggressive nature of the cancer and its poor response to chemotherapy. Furthermore, fibrosarcoma have a high rate of recurrence despite treatment.

There are many novel methods in the works for slowing proliferation and migration of tumor cells as well as increasing sensitivity to chemotherapy. Hopefully with these efforts to identify new drugs and treatment options, the outlook for people with fibrosarcoma will improve.

When to Seek Further Consultation for Fibrosarcoma

Make an appointment as soon as possible if you notice the following symptoms:

A lump/bump of any size located deep within the muscle tissues

A lump/bump that is increasing in size

A lump/bump that becomes painful over time

Recurrence of a lump/bump that has been removed

Questions Your Doctor May Ask to Determine Fibrosarcoma

To diagnose this condition, your doctor would likely ask about the following symptoms and risk factors.